Polish Archaeology in the Mediterranean (9.1997(1998))

The first column to the left of the apse, still standing to a height of
1.50 m above the level of the pavement in which the lower shaft
was buried, is of the common local white limestone. The capital,
which is in the same kind of stone, and has a lower diameter of
50 cm and height equal to 55 cm, was found nearby. The
corresponding column to the right has disappeared. Three other
columns on each side were of black-and-white granite. Only one
(the third from the choir on the left) still preserves its original
height, though broken in two parts, one of which is still in place. It
originally stood 3.10 m high above the pavement. Even with the
capital on top, one cannot suppose anything but arcades between
them. With the span being a regular 2.90 m between columns, the
intrados of the archivolts should have been some 5.10 m above the
floor.
The pilasters at the east end of the aisles have no bases either;
they were crowned with capitals, of which one fails to show any
trace of the decoration, while the left one still has some
recognizable volutes and leaves. It is 60 cm high and 60 cm wide at
bottom, both in front and on the right side, while to the left there is
a flat surface departing at right angle 20 cm from the front, just as
on the pilaster shaft. The length of the stone amounts to 1.20 m and
corresponds exactly to the distance from the pilaster front to the
inner face of the apse wall.
At the western end of the church, two pairs of pillars
supported the last tier of the colonnades separating the aisles. It was
larger than the others, about 4.50 m, but not necessarily higher.
At first glance, it would seem that there are stylobates to the
right and left of the nave, 65 cm and 60 cm wide respectively and
made of blocks clearly distinct from the pavement on either side.
However, the mode of erecting the columns was actually quite
different.

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